87529509 has 12 divisors (see below), whose sum is σ = 128575200. Its totient is φ = 57363624.

The previous prime is 87529501. The next prime is 87529567. The reversal of 87529509 is 90592578.

It is a happy number.

It is not a de Polignac number, because 87529509 - 2³ = 87529501 is a prime.

It is a super-2 number, since 2×87529509² = 15322829891562162, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87529501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 81889 + ... + 82950.

It is an arithmetic number, because the mean of its divisors is an integer number (10714600).

Almost surely, 2^87529509 is an apocalyptic number.

It is an amenable number.

87529509 is a deficient number, since it is larger than the sum of its proper divisors (41045691).

87529509 is a wasteful number, since it uses less digits than its factorization.

87529509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 164904 (or 164901 counting only the distinct ones).

The product of its (nonzero) digits is 226800, while the sum is 45.

The square root of 87529509 is about 9355.7206563685. The cubic root of 87529509 is about 444.0019022319.

The spelling of 87529509 in words is "eighty-seven million, five hundred twenty-nine thousand, five hundred nine".